centre
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Radius
That would be the center.
The fixed point that is located in the center of a circle and is used as the guiding point to draw it is called the "point of origin".
if you mean the point that starts at the edge of the circle and ends in the center then this is the radius (:
The center of a circle is called the origin. It is a point at one end of a radius, the other end of which defines the circumference of the circle.